[Python-Dev] PEP 479: Change StopIteration handling inside generators (original) (raw)

Chris Angelico rosuav at gmail.com
Fri Nov 21 17:47:02 CET 2014

On Sat, Nov 22, 2014 at 3:37 AM, Donald Stufft <donald at stufft.io> wrote:

I don’t have an opinion on whether it’s enough of a big deal to actually change it, but I do find wrapping it with a try: except block and returning easier to understand. If you showed me the current code unless I really thought about it I wouldn't think about the fact that the next() calls can cause the generator to terminate.

And don't forget, by the way, that you can always request the current behaviour by explicitly wrapping the body of the function in try/except:

def izip(iterable1, iterable2): try: it1 = iter(iterable1) it2 = iter(iterable2) while True: v1 = next(it1) v2 = next(it2) yield v1, v2 except StopIteration: pass

That's exactly what current behaviour does, and if you think that that try block is too broad and should be narrowed, then you should support this proposal :)

ChrisA

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